3.2 - img role

See also the related ARIAimg role. A container for a collection of elements that form an image. An img can contain captions and descriptive text, as well as multiple image files that when viewed together give the impression of a single image.

3.3 - alt attribute

The alt attribute is an Alternate text that is shown when the image cannot be displayed (page read by a screen reader)

4 - Security

The img element can be used in conjunction with some other features as a way to effect a port scan from the user's location on the Internet. This can expose local network topologies that the attacker would otherwise not be able to determine.